Silencing muffler



Jan. 4, 1949. A. SCHOTT ET AL SILENCING MUFFLER Filed July 25, 1946 INVENTflR. 19 be] Sc]: 0 it ustave [7. Ebeishauser Patented Jan. 4, 1949 SILENCING MUFFLER AbelSchott and Gustave Ebelshauser, Astoria, Long Island, N. Y.

Application July 25, 1946, Serial No; 686,199

This invention relates to improvements in devices to deaden the noise of escaping gases or vapors and, more specifically, to a new and improved silencing muffler through which the exhaust gases of an internal combustion engine are passed.

The main object of the present invention is the provision of a device of the character described which reduces to a minimum the exhaust noise of airplanes, automobiles, trucks, omnibuses, Diesel locomotives and other motor vehicles without decreasing the eiiiciency of the internal-combustion engines.

Another object of the .presentinvention is the provision of a device of the character described which completely eliminates any fire hazard which has been caused by other muffler constructions or by the operation of internal-combustion engines without mufiler.

Still another object of the present invention is the provision of a device of the character described which consists of only a few simple, inexpensive parts that can be assembled easily, so that this device can be manufactured and sold at a very reasonable price, but which is durable, sturdy, light in weight, simple to instal, and well adapted to withstand the rough usage to which devices of this type are frequently subjected.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the accompanying drawings the preferred forms of the invention have been shown.

In said drawings:

Figure 1 is a front elevation of a preferred embodiment of our invention.

Figure 2 is a longitudinal sectional view on the line 2-2 of Figure 1;

Figure 3 is a cross-sectional view on the line 3-4 of Figure 2; and

Figure 4 is a cross-sectional view on the line of Figure 2.

Similar reference characters refer to similar parts throughout the several views.

In the drawing the numeral l denotes an entire muffler constructed in accordance with our invention. Its main housing or casing has a main portion 2, which is shaped as a blunt open cone, and a cylindrical front portion 3 which is 2 Claims. (01. 181-49) I closed by'a circularwall portion 6. Saidcasing is'double-walled and has a layer 5-of fireproof material, preferably fire cement, betweenits outer wall sections and its inner wall sections land 19. The center of the front wall portion 6is bulged inwardly "and is preferably shaped as a funnel 1, into which is extended the outer extremity i9'iof the exhaust pipe 8 of an internal-combustion engine.

A plurality of diverging concavo-conviex plated-preferably threeplates [0,12 and 14 as in the instance shown-are coaxially arranged within said casing and are held therein and in spaced relation to each other as. well asv to'tthe inner wall sections 4 and I9 by'means' of braces l6; l1 and I8. The-plates Ill, I2.-and Hare arched in toward the funnel l andiareconstructed in the'same manner asthe .wa'lls'of said casing, namely each of said plates consists of two metal disks with a layer of fireproof material, preferably fire cement, therebetween. Plate [0 is provided with perforations II which are larger and/or spaced less apart from one another than are the perforations l3 in plate [2. The plate I4 is provided with perforations l5 which are still smaller and/or spaced wider apart from one another than are the perforations [3 in plate I2.

Concave disks 20, 23 and 25 are arranged beyond the open mouth of the conical section 2, and these disks are coaxial with the plates Ill, l2 and I4 and are held in spaced relation to each other and to the section 2 by means of braces 2|, 22, and 24. We prefer to arrange and shape these disks in the manner shown in the drawing (Figure 2); there it will be seen that the disk 23 is more flat than the disks 20 and 25 and that the disks 20 and 23 are arched in toward the section 2 while the disk 25 is arched in in the opposite direction. A tubular member 26, which is of a smaller diameter than the cylindrical section 3 but of a larger diameter than the disks 20, 23 and 25, is secured to the outer side of the conical section 2 at 21, so that a portion of the section 2 as well as the disks 20, 23 and 25 extend into the tubular member 26. The free end portion 28 of the tubular member 26 is preferably reduced as shown. In order to reduce the air resistance of the device we prefer to secure a conical envelope 29 to the front of the casing section 3.

Since certain changes may be made in the above article and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which as a matter of language might be said to fall therebetween.

Having thus fully described our said invention, what we claim as new and desire to secure by Letters Patent is:

1. A silencing mufiler comprising a casing whose front portion is cylindrical and connected to the exhaust pipe of an internal-combustion engine while its main portion has the form of a, blunt cone, a plurality of perforated diverging concavoconvex plates being coaxially arranged within said casing and being in spaced relation to each other as well as to the inner sides of said casing, a tubular member having a reduced end portion and being with its front extremity secured to the outer side of the main portion of said casing, in such a manner that the latter is partially extended into said tubular member, and a plurality of concave disks being coaxially arranged within said tubular member and being in spaced relation to each other as well as the inner sides of said tubular member and to the main portion of said casing, each of said concave-convex plates as well as the walls of said casing consisting of two layers of metal with a layer of fireproof material therebetween, and the perforations in those of said plates which are close to the front of said casing being larger and less spaced apart from one another than are the perforations in the plates which are farther away from said front, all substantially as set forth.

2. A device of the character described compris- 4 ing a casing whose main portion has the form of an open blunt cone while its front portion is cylindrical and closed by a circular front wall through whose center is extended the outer extremity of the exhaust pipe of an internal-combustion engine, three perforated diverging concavo-convex plates being coaxially arranged within said casing and being arched in toward the center of said front wall and in spaced relation to each other as well as to the inner sides of said casing, a tubular member having a reduced end portion and being with its front extremity secured to the outer side of the main portion of said casing in such a manner that the latter is partially extended into said tubular member, two disks arched in toward said casing being coaxially arranged within said tubular member and being in spaced relation to each other as well as to the inner sides of said tubular member and to the main portion of said casing, and a third disk coaxially arranged with said two disks within said tubular member being close to and arched in toward the reduced portion of said tubular member, said concavoconvex plates as well as the walls of said casing consisting of two layers of metal with a layer of cement therebetween, and the perforations in the concave-convex plate which is closest to the front of said casing being larger and less spaced apart from one another than are the perforations in the next following plate while the perforations in the third plate are still smaller and wider spaced from one another than those in the former, all substantially as described.

ABEL SCHOTI. GUSTAVE A. EBELSHAUSER.

No references cited. 

